#!/usr/bin/python3
# -*-encoding:utf8-*-


def unit_degree(a, b, number):
    """
    :param: e_w: degree DIF between east and west.
    :param: n_s: degree DIF between south and north.
    :return: ew_x: lon unit per grid.
    :return: ew_y: lat unit per grid.
    """
    dis = b - a
    unit = dis/number
    return unit




def code_id():

    pass
